A5084944585- Geological and Geochemical Analysis
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- Geological and Tectonic Studies in Latin America
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University of Bergen
2016-2025
University of Münster
2012
Miami University
2010
South African Environmental Observation Network
2007
University of Cape Town
2004-2007
GFZ Helmholtz Centre for Geosciences
1996-2007
Scripps Institution of Oceanography
2004-2007
University of California, San Diego
2007
Natural History Museum Aarhus
2007
University of Copenhagen
2007
Research Article| March 01, 2011 Ophiolite genesis and global tectonics: Geochemical tectonic fingerprinting of ancient oceanic lithosphere Yildirim Dilek; Dilek † 1Department Geology, Shideler Hall, Miami University, Oxford, Ohio 45056, USA, Faculty Earth Sciences, China University Geosciences at Wuhan, Wuhan 430074, Hubei Province, †E-mail: dileky@muohio.edu. Search for other works by this author on: GSW Google Scholar Harald Furnes 2Department Science & Centre Geobiology, Bergen, Bergen...
A bed of volcanic ash up to 23 cm thick is found in lacustrine and marine sediments western Norway. It formally mamed the Vedde Ash Bed, its age approximately 10,600 yr B.P., i.e., mid-Younger Dryas. The consits pure glass having a bimodal basaltic rhyolitic composition. geochemistry shards suggests an Icelandic source. By means stratigraphic position geochemistry, correlated with zones cores from continental shelf, Norwegian Sea, North Atlatic.
Pillow lava rims from the Mesoarchean Barberton Greenstone Belt in South Africa contain micrometer-scale mineralized tubes that provide evidence of submarine microbial activity during early history Earth. The formed etching glass along fractures, as seen pillow lavas recent oceanic crust. margins organic carbon, and many exhibit isotopically light bulk-rock carbonate delta13C values, supporting their biogenic origin. Overlapping metamorphic magmatic dates suggest life colonized these...
A sheeted-dike complex within the approximately 3.8-billion-year-old Isua supracrustal belt (ISB) in southwest Greenland provides oldest evidence of oceanic crustal accretion by spreading. The geochemistry dikes and associated pillow lavas demonstrates an intraoceanic island arc mid-ocean ridge-like setting, their oxygen isotopes suggest a hydrothermal ocean-floor-type metamorphism. pillows are with gabbroic ultramafic rocks that together make up ophiolitic association: Paleoarchean...
We combine a geological, geochemical and tectonic dataset from 118 ophiolite complexes of the major global Phanerozoic orogenic belts with similar datasets ophiolites 111 Precambrian greenstone to construct an overview oceanic crust generation over 4 billion years. Geochemical discrimination systematics built on immobile trace elements reveal that basaltic units are dominantly subduction-related (75%), linked backarc processes characterized by strong MORB component, in sequences (85%). The...
Tethyan ophiolites have played a major role in the development of ophiolite concept during past 200 years, and contributed significantly to formulations suprasubduction-zone (SSZ) paradigm plate-tectonics theory. Their melt evolution magmatic construction witnessed dispersal supercontinent Pangaea via continental rifting seafloor spreading, opening closure multiple seaways an eastward widening, latitudinal ocean basin (Neotethys), deep mantle recycling processes through subduction-zone...
Ophiolites are important archives of oceanic crust development and preservation in the rock record, Alpine-Himalayan Orogenic Belt (AHOB) is one most comprehensive ophiolite depositories earth's history. We have compiled published data on field occurrences geochemistry from 137 AHOB ophiolites, ranging age Triassic through Cretaceous, order to characterize nature Mesozoic Neotethyan crust. used this synthesis our recent classification approach applied effective geochemical discrimination...
We present a compilation of published data (field, petrography, ages and geochemistry) from 73 ophiolitic complexes the Central Asian Orogenic Belt. The complexes, ranging in age Neoproterozoic to Triassic, have been geochemically classified as subduction-related subduction-unrelated categories applying recent, well-established discrimination diagrams. category is further subdivided into Mid-Ocean Ridge type (MOR), common rift-drift stage Plume type, Backarc (BA), Forearc (FA), (BA-FA)...
Radiocarbon datings of the Saksunarvatn ash bed on Faroe Islands indicate an age 9000–9100 yr B.P. The differs geochemically from both zone 1 in North Atlantic and Vedde Ash Bed Norway Norwegian Sea. All mentioned ashes are assumed to originate Iceland. has been dated at 10,600 ± 60 Consequently, beds provide opportunity for precise dating events around Pleistocene/Holocene boundary marine cores, especially region where two plumes overlap.